Class 171/7 & 171/8 Turbostar DMU
100 mile/h 2 & 4 car units with Cummins/Voith transmission
Built by Bombardier at Derby Litchurch Lane Works between 2003 and 2004
| The units are identical to the Class 170s, except for the replacement of the BSI coupler with a Dellner coupler to allow emergency rescue of Class 377 DC third-rail electric units | 
171721 - 171729 - 2 car
171801 - 171806 - 4 car
Operator - Southern Railways
|  | 171804 London Bridge 2007 |  | 171804 Uckfield 2007 | 
|  | 171804 arriving at East Croydon 2007 |  | 171806 leaving at East Croydon 2007 |